php实现简单的语法高亮函数实例分析

本文实例讲述了php实现简单的语法高亮函数。分享给大家供大家参考。具体分析如下：

这是一个php实现的简单语法高亮显示的函数，注意：这个函数设计的比较简单，可能对某些语法不能高亮显示，你可以自己扩充该函数的功能

function syntax_highlight($code){ // this matches --> "foobar" <-- $code = preg_replace(  '/"(.*?)"/U',   '"<span style="color: #007F00">$1</span>"', $code ); // hightlight functions and other structures like --> function foobar() <---  $code = preg_replace(  '/(/s)/b(.*?)((/b|/s)/()/U',   '$1<span style="color: #0000ff">$2</span>$3',   $code ); // Match comments (like /* */):  $code = preg_replace(  '/(////)(.+)/s/',   '<span style="color: #660066; background-color: #FFFCB1;"><i>$0</i></span>',   $code ); $code = preg_replace(  '/(///*.*?/*//)/s',   '<span style="color: #660066; background-color: #FFFCB1;"><i>$0</i></span>',   $code ); // hightlight braces: $code = preg_replace('/(/(|/[|/{|/}|/]|/)|/->)/', '<strong>$1</strong>', $code); // hightlight variables $foobar $code = preg_replace(  '/(/$[a-zA-Z0-9_]+)/', '<span style="color: #0000B3">$1</span>', $code ); /* The /b in the pattern indicates a word boundary, so only the distinct ** word "web" is matched, and not a word partial like "webbing" or "cobweb"  */ // special words and functions $code = preg_replace(  '//b(print|echo|new|function)/b/',   '<span style="color: #7F007F">$1</span>', $code ); return $code;}/*example-start*//*** Create some example PHP code:*/$example_php_code = '// some code comment:$example = "foobar";print $_SERVER["REMOTE_ADDR"];$array = array(1, 2, 3, 4, 5);function example_function($str) { // reverse string echo strrev($obj);}print example_function("foo");/*** A multiple line comment*/print "Something: " . $example;';// output the formatted code:print '<pre>';print syntax_highlight($example_php_code);print '</pre>';/*example-end*/

希望本文所述对大家的php程序设计有所帮助。